Our expert says:
If he happened to see you naked, this is a bit different from you offering to show him your body.
Whilst his curiosity is normal it is also important that this does not become something he does regularly. Its fine for him to like girls, but not to direct these feelings towards his own sister.
In future I would suggest you let him know that his interest in girls is ok, but its not appropriate to direct this at you - or to steal posessions from you or other girls, or he could find himself in a whole lot of trouble.
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